AL UNSER (1939-2021)The youngest of four racing brothers, Unser was born in in Albuquerque in 1939 to a family of hardcore racers. His father Jerry Unser and two uncles, Louis and Joe, were also drivers. Beginning in 1926 the family began competing in the Pikes Peak International Hill Climb, an annual road race held in Colorado.
Unser began racing himself in 1957 when he was 18, but competed mostly in sprint cars. He made it to Indy in 1965 driving in a car owned by Foyt and was part of the rookie class with future Indy 500 winners Mario Andretti (1969) and Gordon Johncock (1973, 1982).
He dominated in his first Indy win in 1970 by starting from the pole and leading all but 10 of the 200 laps, beating runner-up Mark Donohue by 32 seconds. He won again the next year in the distinctive "Johnny Lightning Special" fielded by Parnelli Jones and finished second to Donohue in 1972. He earned his third Indy win in 1978.
In 1987, he was in Indianapolis to be with his son Al Jr. as the latter prepped for the 500. Al Sr. had been replaced as the Team Penske driver in favor of Danny Ongais. But Ongais crashed in a practice run, so Roger Penske asked Al Sr. if he'd be willing to take the spot. “I said heck yes, I didn’t have to take a second guess about that one because it is a team that is capable of winning,” he replied. Unfortunately, the car was also out of commission - with two weeks to go, they had to use their "backup" car - that began the month as a show car on display in a hotel in Reading, Pennsylvania, where the team was based.
Perhaps a bit out of practice - and 47 years old to boot - Al qualified in the #20 spot, too far back to be a serious challenger for the win.
Here's how the 1987 Indianapolis 500 ended:

He finished his career with a total of 27 starts in the Indy 500, third most in history, and qualified once on the pole and five times on the front row. The Unser family combined for 73 career starts in the Indy 500 -- a number bettered only by the 76 starts by the Andretti family. The Unser participation spans Al (27 races), Bobby (19) and Al Jr. (19), as well as Johnny (5), Robby (2) and Jerry (1).
Al Unser Sr. retired in 1994 and remains the career lap leader for the Indianapolis 500 with 644, leading over half the laps in three of his Indy 500 victories. The closest active driver is Scott Dixon with 570 laps led.
After battling cancer for 17 years, he died at his home in Chama, New Mexico, with his wife, Susan, by his side.
"One of the top 5 racers who has ever lived - and the kindest, calmest, smartest, toughest, most fun, well-liked guy ever." - Mario Andretti
"I will always remember Big Al welcoming me to the speedway. He and Johnny Rutherford were the two helping me with my rookie orientation. He will be missed." - 2021 Indy 500 winner Helio Castroneves
The four-time Indy 500 winners - AJ Foyt, Al Unser, Rick Mears, and Helio Castroneves - with the Borg-Warner Trophy earlier this year: